Selling a C Corporation: How Double Taxation Works and How Owners Avoid It

The two layers, step by step

1. The corporation sells. Gain on every asset, goodwill and recapture alike, is taxed at the flat 21% corporate rate (IRC 11(b), 2026). A C corporation has no capital gains rate, so the 0/15/20% table never applies at this level. Most states then add their own corporate income tax.
2. The corporation liquidates. Under IRC 331, cash distributed in complete liquidation is treated as payment for your stock. Your gain is the distribution minus your stock basis, taxed at long-term rates up to 20% above $613,700 of taxable income for joint filers (Rev. Proc. 2025-32, 2026).
3. The 3.8% NIIT applies. The active-owner exception in IRC 1411(c)(4) covers interests in partnerships and S corporations only, so even a full-time founder generally owes NIIT on C corporation stock gain above the $250,000 joint threshold (IRC 1411, not indexed).

If the corporation distributes property instead of cash, IRC 336 taxes it as if it sold that property at fair market value, so there is no way to hand appreciated assets out untaxed.

What double taxation costs on a real deal

Our engine runs use a $6,000,000 sale by a Wyoming company, chosen so state tax does not muddy the comparison. Selling the stock: the owners pay $1,321,347 on a $5,500,000 gain and keep $4,178,653. Selling the assets: the corporation first pays $1,050,000 (21% of $5,000,000 under IRC 11(b), 2026), then the owners pay $1,071,447 on their liquidation gain and keep $3,378,553. The smaller distribution trims the owners' bill by only $249,900, far less than the $1,050,000 the corporation paid, and a state corporate income tax widens the gap further.

Corporate capital losses, net operating losses and credits can soften the corporate layer, so check the company's return before assuming the full 21% (IRC 11(b), 2026) applies. For the general mechanics of deal type, see asset sale vs stock sale.

Route 1: sell the stock

A stock sale skips the corporate layer entirely, but the buyer inherits the corporation's low inside basis and gets no step-up, plus every historical liability. Expect a lower offer, a larger escrow or both. A Section 338(h)(10) election is not available for a stand-alone C corporation owned by individuals (it covers S corporations and corporate subsidiaries), and a regular Section 338(g) election would recreate the corporate tax at the buyer's expense. A price cut smaller than the corporate tax you avoid still leaves you ahead, so a stock deal is usually worth negotiating for.

Route 2: sell personal goodwill directly

If customers come to the business because of you, part of the goodwill may be your personal property, not the corporation's. In Martin Ice Cream Co. v. Commissioner, 110 T.C. 189 (1998), the Tax Court held that the founder's supermarket relationships were his own asset because he had no employment agreement or non-compete with his company, so the sale of those relationships escaped corporate tax. In Howard v. United States (9th Cir. 2011), a dentist lost the same argument because he had signed a non-compete with his own professional corporation, making the goodwill corporate; the payment was treated as a dividend.

The lessons: no non-compete or employment agreement with your own corporation before the sale, a separate purchase agreement and valuation for the personal goodwill, and a buyer who actually pays you for it. Our third run carves out $2,500,000 of personal goodwill: corporate tax falls to $525,000 and the owners pay $1,196,397, against $1,050,000 plus $1,071,447 without the carve-out. See the personal goodwill analysis.

Route 3: QSBS, the exclusion only C corporations get

Section 1202 is the one big reward for C corporation status. For stock acquired after July 4, 2025, 50% of the gain is excluded after 3 years, 75% after 4 and 100% after 5, up to $15,000,000 per issuer or 10 times basis; older stock needs more than 5 years and keeps a $10,000,000 cap (IRC 1202 as amended by P.L. 119-21, 2025). The company must have been a qualified small business with gross assets under the applicable limit when the stock was issued, and many service fields, including health, law, accounting, consulting and financial services, are excluded. It works only on a sale of stock, never on a corporate asset sale. See QSBS and Section 1045.

Route 4: an ESOP sale under Section 1042

Only C corporation shareholders can defer gain by selling to an employee stock ownership plan under IRC 1042. The plan must own at least 30% of the company's stock right after the sale, you must have held the shares at least 3 years, and you must buy qualified replacement property, stock or bonds of domestic operating companies, within a window from 3 months before to 12 months after the sale. Gain is deferred until the replacement securities are sold, and held until death they may receive a basis step-up. See the ESOP and Section 1042 analysis.

Route 5: convert to S and wait out the built-in gains period

Electing S status now does not erase the corporate layer on value that already exists. IRC 1374 taxes the built-in gain present at conversion at 21% (IRC 11(b), 2026) if assets are sold during the 5-year recognition period that begins on the first day of the first S year. Appreciation after conversion, and all gain once the period ends, passes through with one layer of tax. For an owner planning an exit five or more years out, a conversion with an appraisal on the conversion date can turn a future asset sale into a single-tax event.

One more trap for seller financing: if the corporation takes a note and then liquidates, IRC 453B taxes the corporation on distributing the note right away, even though shareholders can keep reporting on the installment method under IRC 453(h) when the liquidation finishes within 12 months of the plan. An S corporation gets an exception; a C corporation does not. To model these routes against each other with your numbers, get the Big Sale Tax Analysis.

Run your own numbers

Frequently asked questions